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1

Ethernet

Network Fundamentals – Chapter 9

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© 2007 Cisco Systems, Inc. All rights reserved.

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Objectives



Identify the basic characteristics of network media used

in Ethernet.



Describe the physical and data link features of Ethernet.



Describe the function and characteristics of the media

access control method used by Ethernet protocol.



Explain the importance of Layer 2 addressing used for

data transmission and determine how the different types

of addressing impacts network operation and

performance.



Compare and contrast the application and benefits of

using Ethernet switches in a LAN as apposed to using

hubs.



Explain the ARP process.

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Characteristics of Network Media used

in Ethernet



Identify several characteristics of Ethernet in its

early years.

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Characteristics of Network Media used

in Ethernet



Describe the emergence of the LAN switch as a

key innovation for managing collisions on

Ethernet-based networks

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Characteristics of Network Media used

in Ethernet



Identify the characteristics of state-of-the-art

Ethernet and describe its utilization of cabling

and point-to-point topography

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Physical and Data Link Features of

Ethernet



Standards and Implementation

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Physical and Data Link Features of

Ethernet



Describe how the Ethernet operates across two
layers of the OSI model

8

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Physical and Data Link Features of

Ethernet



Logic Link Control – Connecting the Upper Layers

9

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Physical and Data Link Features of

Ethernet



Media Access Control

(MAC)

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Physical and Data Link Features of

Ethernet



Physical Implementations of the Ethernet

11

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Function and Characteristics of the

Media Access Control Method



MAC in Ethernet

12

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Function and Characteristics of the

Media Access Control Method



Carrier Sense Multiple Access with Collision

Detection

13

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Function and Characteristics of the

Media Access Control Method



Ethernet Timing

14

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Layer 2 addressing and its Impact on

Network Operation and Performance



The Frame – Encapsulating the Packet

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Layer 2 addressing and its Impact on

Network Operation and Performance



The Ethernet MAC Address

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Layer 2 addressing and its Impact on

Network Operation and Performance



Hexadecimal Numbering and Addressing

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Layer 2 addressing and its Impact on

Network Operation and Performance



Another Layer of Addressing

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Layer 2 addressing and its Impact on

Network Operation and Performance



Ethernet Unicast, Multicast and Broadcast

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Compare and Contrast the Use of

Ethernet Switches versus Hubs in a

LAN.



Legacy Ethernet – Using Hubs

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Compare and Contrast the Use of

Ethernet Switches versus Hubs in a

LAN.



Ethernet – Using Switches

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Compare and Contrast the Use of

Ethernet Switches versus Hubs in a

LAN.



Describe how a switch can eliminate collisions,

backoffs and re- transmissions, the leading

factors in reduced throughput on a hub-based

Ethernet network

22

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Explain the Address Resolution

Protocol (ARP) process.



Mapping IP to MAC Addresses

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Explain the Address Resolution

Protocol (ARP) process.



ARP – Destinations Outside the Local Network

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Explain the Address Resolution

Protocol (ARP) process.



ARP – Removing Address Mappings

25

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Explain the Address Resolution

Protocol (ARP) process.



ARP Broadcasts - Issues

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Summary

27

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